Rapid and eco-friendly synthesis of graphene oxide-silica nanohybrids

Autor: MAIO, Andrea, SCAFFARO, Roberto, Lopresti, Francesco, BOTTA, Luigi, ROSSELLI, Sergio, BRUNO, Maurizio, AGNELLO, Simonpietro, Bondì, ML, Mezzi, A.
Přispěvatelé: Maio, A, Scaffaro, R, Lopresti, F, Botta, L, Rosselli, S, Bruno, M, Agnello, S, Bondì, ML, Mezzi, A.
Jazyk: angličtina
Rok vydání: 2014
Předmět:
The increasing interest in Graphene oxide (GO) is due to many issues: the presence of both sp2-conjugated atoms and oxygen-containing functional groups provides a strong hydrophilicity and the possibility to further functionalize it with other molecules (i.e. π-π interactions
covalent attachment
etc.) [1]. Furthermore
since the GO is biocompatible and noncytotoxic
many studies have been recently focused on the development of GO-based nanodevices for bioimaging
DNA detection
drug delivery. Due to their low cytotoxicity and large internal surface area
silica nanoparticles have been taken into account as promising material for biolabeling and drug loading/delivery. Particular consideration has recently been demonstrated for GO-silica composites because of the potentialities for electrical applications
their chemical inertia and stability toward ions exposure. The possibility to combine the extraordinary properties of GO and silica offers several advantages for the realization of nanoprobes for biological applications and of biosensor [1
2]. The strategy for the fabrication of GO-nanosilica nanohybrids can be schematized as follows: (i) synthesis of GO by oxidizing graphite powder with the method described by Marcano et al. [3] (ii) Preparation of oxygen-loaded silica nanoparticles by thermal treatments in controlled atmosphere
in order to induce high NIR emission at 1272 nm from high purity silica nanoparticles. (iii) preparation of GrO-silica nanohybrid films via rapid solvent casting in water. The nanohybrids were tested by XPS
FTIR
Raman analysis
UV
photoluminescence analysis
TGA
Zeta potential measurements
electrical tests
AFM and SEM. Several nanohybrids were prepared by combining two different typologies of GO and two different samples of silica
Databáze: OpenAIRE
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